Question

Write short notes on any two early calculating devices​

Answer 1

Answer:

1) Abacus : Abacus is a manual calculating device that can traced the ancient counting boards. It first used in Mesopotamia around 3500 BC It consisted of pitted boards with pebbles or wires. But the modern abacus is probably originated in the 15 th century China.

Answer 2

Answer:

Abacus, plural abaci or abacuses, calculating device, probably of Babylonian origin, that was long important in commerce. It is the ancestor of the modern calculating machine and computer.

The abacus, generally in the form of a large calculating board, was in universal use in Europe in the Middle Ages, as well as in the Arab world and in Asia. It reached Japan in the 16th century. The introduction of the Hindu-Arabic notation, with its place value and zero, gradually replaced the abacus, though it was still widely used in Europe as late as the 17th century and survives today in the Middle East, China, and Japan; an expert practitioner can compete against many modern mechanical calculating machines.

Pascaline, also called Arithmetic Machine, the first calculator or adding machine to be produced in any quantity and actually used. The Pascaline was designed and built by the French mathematician-philosopher Blaise Pascal between 1642 and 1644.

Explanation:

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